package com.sbuilder;

public class Demo03 {
    public static void main(String[] args) {
        StringBuilder sb = new StringBuilder();
        sb.append("hello");
        //String s = sb;  错误
        //StringBuilder >> String
        String s = sb.toString();
        System.out.println(s);

        //String >>  StringBuilder
        StringBuilder sb1 = new StringBuilder(s);

        //StringBuilder sb2 = s;错误
    }
}
